<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    const data = [
        {id:"01", name: "张大大", pid:"", job: "项目经理"},
        {id:"02", name: "小亮", pid:"01", job: "产品leader"},
        {id:"03", name: "小美", pid:"01", job: "UIleader"},
        {id:"04", name: "老马", pid:"01", job: "技术leader"},
        {id:"05", name: "老王", pid:"01", job: "测试leader"},
        {id:"06", name: "老李", pid:"01", job: "运维leader"},
        {id:"07", name: "小丽", pid:"02", job: "产品经理"},
        {id:"08", name: "大光", pid:"02", job: "产品经理"},
        {id:"09", name: "小高", pid:"03", job: "UI设计师"},
        {id:"10", name: "小刘", pid:"04", job: "前端工程师"},
        {id:"11", name: "小华", pid:"04", job: "后端工程师"},
        {id:"12", name: "小李", pid:"04", job: "后端工程师"},
        {id:"13", name: "小赵", pid:"05", job: "测试工程师"},
        {id:"14", name: "小强", pid:"05", job: "测试工程师"},
        {id:"15", name: "小涛", pid:"06", job: "运维工程师"}
      ]

// 完成代码
function arrToTree(data) {
  // 你的代码
  const treeData = []
  data.forEach(item => {
    if(!item.pid) {
      treeData.push(item)
    }
    const children = data.filter(data => data.pid === item.id)
    if(!children.length) return
    item.children = children
  })
  return treeData
}

// 目标：
const treeData = arrToTree(data)
console.log(treeData);
  </script>
</body>
</html>